1 Answer
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In the folder c:\program files\windows sidebar\gadgets\calendar.gadget\en-us\js is a file called calendar.js, if you edit this (you will have to change the permissions/take ownership to do so)and change the line

loc.day.first = vbsFirstDayOfWeek()-1;

to

loc.day.first = vbsFirstDayOfWeek();

this will change the start day from Sunday to Monday.

I've also change the same file in the program files (x86)... folder as well.

Seems to work well with no issues so far, remember take a backup first.

This will probably work, just need to fix the d*mn admin rights on Vista... When I have confirmed it I'll accept it
–
DefaultMay 19 '10 at 12:14

How come I can't change that file, even though I am administrator? I tried setting notepad, cmd and explorer as (explicit) admin with no prevail. That file seems impenetrable. I know it has to do with the Program Files folder (I've experienced it before) and usually it works. This time it does not
–
DefaultMay 20 '10 at 9:54

Have you tried adding yourself as the owner of the file and then setting up the permissions
–
admintechMay 20 '10 at 10:49